linux-kernel - [PATCH 2/3] Driver for user access to internal clocks

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Date:	Thu, 8 Jan 2009 10:50:03 +0100
From:	"Davide Rizzo" <elpa.rizzo@...il.com>
To:	linux-kernel@...r.kernel.org, hjk@...utronix.de, gregkh@...e.de,
	ben-linux@...ff.org
Subject: [PATCH 2/3] Driver for user access to internal clocks

Specific for Samsung S3C24xx platforms
Allows any driver to get a device specific clock.
It recognizes also the form clkname.X

Signed-off-by: Davide Rizzo <elpa-rizzo@...il.com>
---
diff -urNp linux-2.6.28/arch/arm/plat-s3c24xx/clock.c
linux-2.6.28.elpa/arch/arm/plat-s3c24xx/clock.c
--- linux-2.6.28/arch/arm/plat-s3c24xx/clock.c	2008-12-25
00:26:37.000000000 +0100
+++ linux-2.6.28.elpa/arch/arm/plat-s3c24xx/clock.c	2009-01-07
19:25:07.000000000 +0100
@@ -67,11 +67,19 @@ static int clk_null_enable(struct clk *c

 struct clk *clk_get(struct device *dev, const char *id)
 {
+	long idno;
+	char *name = (char *)id;
+	char *dotpos = strrchr(id, '.');
 	struct clk *p;
 	struct clk *clk = ERR_PTR(-ENOENT);
-	int idno;

-	if (dev == NULL || dev->bus != &platform_bus_type)
+	if (dotpos) {
+		int err = strict_strtol(dotpos + 1, 10, &idno);
+		if (err)
+			return ERR_PTR(err);
+		name = kstrdup(id, GFP_KERNEL);
+		name[dotpos - id] = '\0';
+	} else if (dev == NULL || dev->bus != &platform_bus_type)
 		idno = -1;
 	else
 		idno = to_platform_device(dev)->id;
@@ -80,7 +88,7 @@ struct clk *clk_get(struct device *dev,

 	list_for_each_entry(p, &clocks, list) {
 		if (p->id == idno &&
-		    strcmp(id, p->name) == 0 &&
+		    strcmp(name, p->name) == 0 &&
 		    try_module_get(p->owner)) {
 			clk = p;
 			break;
@@ -92,7 +100,7 @@ struct clk *clk_get(struct device *dev,

 	if (IS_ERR(clk)) {
 		list_for_each_entry(p, &clocks, list) {
-			if (p->id == -1 && strcmp(id, p->name) == 0 &&
+			if (p->id == -1 && strcmp(name, p->name) == 0 &&
 			    try_module_get(p->owner)) {
 				clk = p;
 				break;
@@ -101,6 +109,9 @@ struct clk *clk_get(struct device *dev,
 	}

 	mutex_unlock(&clocks_mutex);
+
+	if (dotpos)
+		kfree(name);
 	return clk;
 }
--
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